Polarization selection rules for the allowed optical transitions in europium–terbium double activated calcium tungstate phosphor

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• 作者：Nazarov ; M.V. ; Tsukerblat ; B.S. ; Popovici ; E.-J. ; Jeon ; D.Y.
• 关键词：71.15.&minus ; m ; 78.20.Bh ; 78.55.&minus ; m ; A. Phosphor ; A. CaWO₄ ; Eu ; Tb ; D. Optical properties ; E. Luminescence
• 刊名：Solid State Communications
• 出版年：2005
• 期刊代码：101_00381098
• 类别：ms
• 出版时间：January, 2005
• 卷：133
• 期：3
• 页码：203-208
• 文件大小：163 K

摘要

The paper is devoted to the problem of the optical anisotropy of the rare-earth ions occupying low-symmetry positions in crystals. The crystal field multiplets arising from LSJ terms of Eu³⁺ and Tb³⁺ ions in the crystal field of calcium tungstate scheelite (CaWO₄) are analyzed (S₄ point symmetry). The selection rules, in particular, polarization rules for the allowed electric dipole optical transitions in the electronic shells of the Eu³⁺ and Tb³⁺ in CaWO₄ host lattice are discussed. Special attention is paid to the study of the angular (polarization) dependence of the two-photon absorption that seems to be an effective tool for the understanding of the complicated optical pattern. The peculiarities of the anisotropy of the two-photon absorption prove to be specific for each allowed dipole transition in S₄ symmetry center.